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// 6 september 2015
#include "uipriv_unix.h"
#include "draw.h"
struct uiDrawPath {
GArray *pieces;
uiDrawFillMode fillMode;
gboolean ended;
};
struct piece {
int type;
double d[8];
int b;
};
enum {
newFigure,
newFigureArc,
lineTo,
arcTo,
bezierTo,
closeFigure,
addRect,
};
uiDrawPath *uiDrawNewPath(uiDrawFillMode mode)
{
uiDrawPath *p;
p = uiNew(uiDrawPath);
p->pieces = g_array_new(FALSE, TRUE, sizeof (struct piece));
p->fillMode = mode;
return p;
}
void uiDrawFreePath(uiDrawPath *p)
{
g_array_free(p->pieces, TRUE);
uiFree(p);
}
static void add(uiDrawPath *p, struct piece *piece)
{
if (p->ended)
userbug("You cannot modify a uiDrawPath that has been ended. (path: %p)", p);
g_array_append_vals(p->pieces, piece, 1);
}
void uiDrawPathNewFigure(uiDrawPath *p, double x, double y)
{
struct piece piece;
piece.type = newFigure;
piece.d[0] = x;
piece.d[1] = y;
add(p, &piece);
}
void uiDrawPathNewFigureWithArc(uiDrawPath *p, double xCenter, double yCenter, double radius, double startAngle, double sweep, int negative)
{
struct piece piece;
if (sweep > 2 * uiPi)
sweep = 2 * uiPi;
piece.type = newFigureArc;
piece.d[0] = xCenter;
piece.d[1] = yCenter;
piece.d[2] = radius;
piece.d[3] = startAngle;
piece.d[4] = sweep;
piece.b = negative;
add(p, &piece);
}
void uiDrawPathLineTo(uiDrawPath *p, double x, double y)
{
struct piece piece;
piece.type = lineTo;
piece.d[0] = x;
piece.d[1] = y;
add(p, &piece);
}
void uiDrawPathArcTo(uiDrawPath *p, double xCenter, double yCenter, double radius, double startAngle, double sweep, int negative)
{
struct piece piece;
if (sweep > 2 * uiPi)
sweep = 2 * uiPi;
piece.type = arcTo;
piece.d[0] = xCenter;
piece.d[1] = yCenter;
piece.d[2] = radius;
piece.d[3] = startAngle;
piece.d[4] = sweep;
piece.b = negative;
add(p, &piece);
}
void uiDrawPathBezierTo(uiDrawPath *p, double c1x, double c1y, double c2x, double c2y, double endX, double endY)
{
struct piece piece;
piece.type = bezierTo;
piece.d[0] = c1x;
piece.d[1] = c1y;
piece.d[2] = c2x;
piece.d[3] = c2y;
piece.d[4] = endX;
piece.d[5] = endY;
add(p, &piece);
}
void uiDrawPathCloseFigure(uiDrawPath *p)
{
struct piece piece;
piece.type = closeFigure;
add(p, &piece);
}
void uiDrawPathAddRectangle(uiDrawPath *p, double x, double y, double width, double height)
{
struct piece piece;
piece.type = addRect;
piece.d[0] = x;
piece.d[1] = y;
piece.d[2] = width;
piece.d[3] = height;
add(p, &piece);
}
void uiDrawPathEnd(uiDrawPath *p)
{
p->ended = TRUE;
}
void runPath(uiDrawPath *p, cairo_t *cr)
{
guint i;
struct piece *piece;
void (*arc)(cairo_t *, double, double, double, double, double);
if (!p->ended)
userbug("You cannot draw with a uiDrawPath that has not been ended. (path: %p)", p);
cairo_new_path(cr);
for (i = 0; i < p->pieces->len; i++) {
piece = &g_array_index(p->pieces, struct piece, i);
switch (piece->type) {
case newFigure:
cairo_move_to(cr, piece->d[0], piece->d[1]);
break;
case newFigureArc:
cairo_new_sub_path(cr);
// fall through
case arcTo:
arc = cairo_arc;
if (piece->b)
arc = cairo_arc_negative;
(*arc)(cr,
piece->d[0],
piece->d[1],
piece->d[2],
piece->d[3],
piece->d[3] + piece->d[4]);
break;
case lineTo:
cairo_line_to(cr, piece->d[0], piece->d[1]);
break;
case bezierTo:
cairo_curve_to(cr,
piece->d[0],
piece->d[1],
piece->d[2],
piece->d[3],
piece->d[4],
piece->d[5]);
break;
case closeFigure:
cairo_close_path(cr);
break;
case addRect:
cairo_rectangle(cr,
piece->d[0],
piece->d[1],
piece->d[2],
piece->d[3]);
break;
}
}
}
uiDrawFillMode pathFillMode(uiDrawPath *path)
{
return path->fillMode;
}
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